WO2010092048A1 - Seat element moulded from expandable and reticulable polyolefin material - Google Patents

Seat element moulded from expandable and reticulable polyolefin material Download PDF

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Publication number
WO2010092048A1
WO2010092048A1 PCT/EP2010/051582 EP2010051582W WO2010092048A1 WO 2010092048 A1 WO2010092048 A1 WO 2010092048A1 EP 2010051582 W EP2010051582 W EP 2010051582W WO 2010092048 A1 WO2010092048 A1 WO 2010092048A1
Authority
WO
WIPO (PCT)
Prior art keywords
template
mould
frame
seat
expansion
Prior art date
Application number
PCT/EP2010/051582
Other languages
French (fr)
Inventor
Maurizio Vecchiola
Original Assignee
Finproject S.P.A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Finproject S.P.A filed Critical Finproject S.P.A
Priority to PL10705836T priority Critical patent/PL2395878T3/en
Priority to CA2750804A priority patent/CA2750804C/en
Priority to ES10705836T priority patent/ES2421510T3/en
Priority to EP10705836.4A priority patent/EP2395878B1/en
Priority to CN2010800077380A priority patent/CN102316763B/en
Priority to US13/138,266 priority patent/US20110277909A1/en
Priority to RU2011137519/12A priority patent/RU2503390C2/en
Priority to BRPI1008079-1A priority patent/BRPI1008079B1/en
Priority to SI201030277T priority patent/SI2395878T1/en
Priority to MX2011008559A priority patent/MX2011008559A/en
Publication of WO2010092048A1 publication Critical patent/WO2010092048A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/18—Seat parts having foamed material included in cushioning part
    • A47C7/20—Seat parts having foamed material included in cushioning part with reinforcement in the foam layer
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/18—Seat parts having foamed material included in cushioning part
    • A47C7/185—Seat parts having foamed material included in cushioning part with a stiff, rigid support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/027—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles the foaming continuing or beginning when the mould is opened
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B29C44/569—Shaping and joining components with different densities or hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/582—Moulds for making undercut articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/665—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using shrinking during cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73715—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable heat-shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/70—Upholstery springs ; Upholstery
    • B60N2/7017—Upholstery springs ; Upholstery characterised by the manufacturing process; manufacturing upholstery or upholstery springs not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/771—Seats

Definitions

  • the present patent application for industrial invention relates to a manufacturing method of a seat element made of expandable and reticulable polyolefin material, especially for vehicles.
  • seat element refers to seat, back and headrest.
  • the present invention is not exclusively limited to seats for vehicles, and is also extended to interior decoration seats, such as tools, armchairs, sofas and similar items.
  • expandable and reticulable polyolefin materials are characterised by properties of lightness, softness, resistance to wear and water, thus being especially suitable for manufacturing various kinds of seats.
  • expandable and reticulable polyolefin materials are generally not used to manufacture seat elements because they are impaired by some drawbacks during the preparation and realisation process.
  • these items are manufactured by injecting into the mould plastic material that expands and reticulates inside it.
  • the mould is maintained at a certain temperature in such a way to ensure that, during the cycle-time in which the material is closed inside the mould, the reticulation of the material and decomposition of expanding loads are performed.
  • a seat element using these materials should be coupled with a support frame in order to make it stiffer and use it.
  • the coupling of the seat element with the support frame is not simple due the dimensional changes of the seat after moulding, expansion and reticulation.
  • the seat element is provided with holes to receive fixing means, these holes may not match the holes of the frame.
  • the patent application DE 27 17 268 discloses a seat element made of expanded polyurethane. Although the appearance of expanded polyurethane is similar to expanded polyolefin, it must be noted that the two technologies differ in their production process. Therefore, as it is known, in the polyurethane technology, the seat element is obtained from moulding and left in the mould to cool down.
  • the patent application DE 20 2006 013633 discloses a seat element comprising a support made of rigid material and a covering coupled with the support in such a way to form a cavity between support and covering.
  • the cavity is filled by injecting a filling material.
  • the covering made of polyurethane, polyolefin or other waterproof material is a premoulded covering. Therefore, the expanded covering (which could also have a polyolefin base) is a stable material that has already been subject to reticulation and consequently is no longer subject to dimensional changes.
  • the support and premoulded covering are arranged in a mould, in which filling material is injected.
  • the covering made (also) of polyolefin material is subject to thermoforming, but the polyolefin inside the covering is not subject to reticulation or dimensional change.
  • the purpose of the present invention is to eliminate the drawbacks of the known art, by devising a manufacturing method of a seat element made of expanded material that complies perfectly with the dimensional features of the original design and, at the same time, is inexpensive and simple to produce and install.
  • the manufacturing method of a seat element according to the present invention comprises the following phases: - injection into a mould of a material with expandable and reticulable polyolefin base,
  • the new manufacturing process provides for a first expansion phase of the seat after opening the mould, and a thermoretraction phase during which the seat is reduced (thermoretraction) to the desired dimensions during cooling.
  • Fig. 1 is a perspective view of a first embodiment of the seat element, in which the body of expanded material has just come out of the mould;
  • Fig. 2 is a cross-sectional view of the seat element of Fig. 1 after assembly and before thermoretraction of the body of expanded material;
  • Fig. 3 is a cross-sectional view of the seat element of Fig. 2 after assembly, after thermoretraction of the body of expanded material;
  • Fig. 4 is a cross-sectional view of the seat element of Fig. 3 mounted on a frame
  • Fig. 5 is the same as Fig. 2, except for it shows a second embodiment of the seat element of the invention.
  • Fig. 6 is a cross-sectional view of the seat element of Fig. 5 mounted on a frame.
  • the seat element (1 ) comprises a body (2) of soft material and a template (3) of rigid material.
  • the body (2) is made of expandable and reticulable polyolefin material, by means of injection moulding.
  • the polyolefin material is injected into the mould, heated and subject to reticulation process. During the reticulation process the polyolefin material expands, taking the shape of the mould. The expansion of the polyolefin material continues and then the body is released spontaneously from the mould.
  • the mould is small scale compared to the seat to be manufactured (for example, a mould with cavity 50% smaller than the seat can be made).
  • the body (2) is provided on the back surface with a perimeter frame (20) that defines a recessed seat (21 ) adapted to receive the template (3).
  • the internal borders of the perimeter frame (20) define housings in undercut (22) having an overturned-U shape, adapted to receive the borders of the template (3).
  • Fig. 1 shows a body (2) of the seat element with basically parallelepiped shape with a rectangular back frame (20); however, the body (2) can be given any type of shape, with circular or polygonal perimeter.
  • the housings in undercut (22) are obtained along the entire internal perimeter of the frame (20); however, only two housings in undercut (22) can be provided on opposite sides of the frame (20).
  • Blind holes (23) are obtained in the back seat (21 ) of the body (2), being adapted to receive fixing means, such as nuts or bolts.
  • the template (3) consists in a plate made of rigid material, such as for example metal or PVC or Polyamide (Nylon).
  • a flat rectangular template is shown in this first embodiment of the invention; however, the template can also be curved.
  • the template (3) is provided with through holes (33) to receive fixing means, such as screws or bolts.
  • the holes (33) can also be threaded.
  • the holes (33) of the template are arranged in register with the blind holes (23) of the body (2).
  • the holes (23) of the body have a higher diameter than the holes (33) of the template because they must receive nuts and because they must compensate possible misalignment mistakes.
  • the template (3) is dimensioned in compliance with the specific dimensions of the seat element to be obtained.
  • the material of the body continues its expansion process.
  • the template (3) is inserted in the recessed seat (21 ) of the body (2). As shown in Fig. 2, the borders of the template (3) are received with clearance in the housings in undercut (22) of the body.
  • the body (2) shrinks during cooling. Accordingly, as shown in Fig. 3, the housings in undercut (22) of the body press on the borders of the template (3) eliminating any clearance and interrupting thermoretraction. In this way the template (3) is firmly anchored to the body (2) and at the same time prevents additional thermoretraction of the body (2). Therefore, the body (2) perfectly complies with the dimensional specifications of the template (3), regardless of the free thermoretraction that would have been suffered by the material of the body (2).
  • the template (3) In addition to act as control element of the dimensions of the body (2), the template (3) also acts as stiffening element of the body (2), without the need to provide the body (2) with stiffening ribs that increase the complexity of the mould and without the need to use stiffening inserts that are difficult to match with the body (2). Moreover, as shown in Fig. 4, the template (3) also acts as fixing means with a frame (4) to anchor the seat (1 ) to the frame (4).
  • the frame (4) can be provided with screws (40) arranged in register with the holes (33) of the template.
  • the body (2) is disassembled from the template (3); then the template (3) is fixed to the frame (4) inserting the screws (40) in the holes (33) of the template and screwing the nuts (41 ) on the screws (40); finally, the body (2) is assembled again on the template (3) in such a way that the nuts (41 ) are received in the blind holes (23) of the body (2).
  • FIGs. 5 and 6 show a seat element (101 ) according to a second embodiment of the invention, wherein the template (103) is provided with screw fixing means (133) instead of holes. Accordingly, the frame (104) is provided with holes (140) to receive the screws (133) of the template. Nuts (141 ) are screwed to the screws (133) of the template to fix the frame. In this case, it is not necessary to disassemble the body (2) from the template (103) and assemble it again on the template after fixing the template to the frame (104).
  • Figs. 5 and 6 show a concave template (103) provided with two flat sections (130) on opposite borders that are inserted in the housings in undercut (22) of the body (2). Accordingly, also the frame (104) must have a concave seat to receive the template (103).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Seats For Vehicles (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Materials For Medical Uses (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Printing Methods (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)

Abstract

A manufacturing method of a seat element (1; 101) is disclosed, comprising a body (2) obtained from moulding polyolefin plastic materials of expandable and reticulable type, and a template (3; 103) made of rigid material, which is coupled with the body (2) when it is still hot, in such a way to control the shrinking of the material of the body during cooling.

Description

Description
Seat element moulded from expandable and reticulable polyolefin material.
The present patent application for industrial invention relates to a manufacturing method of a seat element made of expandable and reticulable polyolefin material, especially for vehicles.
The term "seat element" refers to seat, back and headrest. The present invention is not exclusively limited to seats for vehicles, and is also extended to interior decoration seats, such as tools, armchairs, sofas and similar items.
As it is known, expandable and reticulable polyolefin materials are characterised by properties of lightness, softness, resistance to wear and water, thus being especially suitable for manufacturing various kinds of seats.
Nevertheless, expandable and reticulable polyolefin materials are generally not used to manufacture seat elements because they are impaired by some drawbacks during the preparation and realisation process.
In fact, these items are manufactured by injecting into the mould plastic material that expands and reticulates inside it. The mould is maintained at a certain temperature in such a way to ensure that, during the cycle-time in which the material is closed inside the mould, the reticulation of the material and decomposition of expanding loads are performed.
When the mould is opened, the product is spontaneously released from the mould because of its violent expansion, continues on expanding and then starts shrinking during cooling. The expansion and shrinking processes cannot be controlled exactly, thus giving high rates of rejects during industrial production.
Consequently, the result would be a seat element that does not comply with the dimensional requirements established at design level and is difficult to use for modular assembly with other elements.
Moreover, it must be considered that expandable materials are mostly soft materials. Therefore, a seat element using these materials should be coupled with a support frame in order to make it stiffer and use it. The coupling of the seat element with the support frame is not simple due the dimensional changes of the seat after moulding, expansion and reticulation. In fact, if the seat element is provided with holes to receive fixing means, these holes may not match the holes of the frame.
Therefore, coupling of the seat element with the frame is complex and expensive, requiring a special adjustment of the seat element and/or frame.
The patent application DE 27 17 268 discloses a seat element made of expanded polyurethane. Although the appearance of expanded polyurethane is similar to expanded polyolefin, it must be noted that the two technologies differ in their production process. Therefore, as it is known, in the polyurethane technology, the seat element is obtained from moulding and left in the mould to cool down.
The patent application DE 20 2006 013633 discloses a seat element comprising a support made of rigid material and a covering coupled with the support in such a way to form a cavity between support and covering. The cavity is filled by injecting a filling material. The covering made of polyurethane, polyolefin or other waterproof material is a premoulded covering. Therefore, the expanded covering (which could also have a polyolefin base) is a stable material that has already been subject to reticulation and consequently is no longer subject to dimensional changes. The support and premoulded covering are arranged in a mould, in which filling material is injected. The covering made (also) of polyolefin material is subject to thermoforming, but the polyolefin inside the covering is not subject to reticulation or dimensional change.
The purpose of the present invention is to eliminate the drawbacks of the known art, by devising a manufacturing method of a seat element made of expanded material that complies perfectly with the dimensional features of the original design and, at the same time, is inexpensive and simple to produce and install.
This purpose has been achieved according to the present invention, with the characteristics illustrated in the attached independent claim 1.
Advantageous embodiments are disclosed in the dependent claims.
The manufacturing method of a seat element according to the present invention comprises the following phases: - injection into a mould of a material with expandable and reticulable polyolefin base,
- reticulation of said polyolefin material inside the mould, in such a way to obtain a body having the shape of the mould,
- spontaneous release of the seat when opening the mould due to the dimensional increment caused by the expanding agents contained in the material,
- prosecution of expansion of the body outside the mould until expansion is completed, and
- coupling of said body with a template made of rigid material, when the body has completed expansion, and before the material of the body starts to shrink during cooling, and
- cooling and thermoretraction of the body controlled by the template, in such a way that the body complies with the original specifications of the seat.
The new manufacturing process provides for a first expansion phase of the seat after opening the mould, and a thermoretraction phase during which the seat is reduced (thermoretraction) to the desired dimensions during cooling.
The use of the template results in a series of advantages:
- it allows for perfectly control of the final dimensions of the body of the seat element; - it offers a stiffening system of the seat element;
- it may be provided with stable and resistant fixing means in order to anchor the seat to a frame.
Additional characteristics of the invention will appear evident from the following detailed description, which refers to merely illustrative, not limiting embodiments, illustrated in the enclosed drawings, wherein:
Fig. 1 is a perspective view of a first embodiment of the seat element, in which the body of expanded material has just come out of the mould;
Fig. 2 is a cross-sectional view of the seat element of Fig. 1 after assembly and before thermoretraction of the body of expanded material;
Fig. 3 is a cross-sectional view of the seat element of Fig. 2 after assembly, after thermoretraction of the body of expanded material;
Fig. 4 is a cross-sectional view of the seat element of Fig. 3 mounted on a frame; Fig. 5 is the same as Fig. 2, except for it shows a second embodiment of the seat element of the invention; and
Fig. 6 is a cross-sectional view of the seat element of Fig. 5 mounted on a frame.
Referring to Figs. 1 - 4 a first embodiment of a seat element is disclosed, being generally indicated with numeral (1 ). The seat element (1 ) comprises a body (2) of soft material and a template (3) of rigid material.
The body (2) is made of expandable and reticulable polyolefin material, by means of injection moulding. The polyolefin material is injected into the mould, heated and subject to reticulation process. During the reticulation process the polyolefin material expands, taking the shape of the mould. The expansion of the polyolefin material continues and then the body is released spontaneously from the mould.
It must be considered that the mould is small scale compared to the seat to be manufactured (for example, a mould with cavity 50% smaller than the seat can be made).
The body (2) is provided on the back surface with a perimeter frame (20) that defines a recessed seat (21 ) adapted to receive the template (3). The internal borders of the perimeter frame (20) define housings in undercut (22) having an overturned-U shape, adapted to receive the borders of the template (3).
Fig. 1 shows a body (2) of the seat element with basically parallelepiped shape with a rectangular back frame (20); however, the body (2) can be given any type of shape, with circular or polygonal perimeter.
Preferably, the housings in undercut (22) are obtained along the entire internal perimeter of the frame (20); however, only two housings in undercut (22) can be provided on opposite sides of the frame (20). Blind holes (23) are obtained in the back seat (21 ) of the body (2), being adapted to receive fixing means, such as nuts or bolts.
The template (3) consists in a plate made of rigid material, such as for example metal or PVC or Polyamide (Nylon). A flat rectangular template is shown in this first embodiment of the invention; however, the template can also be curved.
The template (3) is provided with through holes (33) to receive fixing means, such as screws or bolts. The holes (33) can also be threaded. In any case the holes (33) of the template are arranged in register with the blind holes (23) of the body (2). The holes (23) of the body have a higher diameter than the holes (33) of the template because they must receive nuts and because they must compensate possible misalignment mistakes.
The template (3) is dimensioned in compliance with the specific dimensions of the seat element to be obtained.
In fact, when the body (2) is spontaneously released from the mould, the material of the body continues its expansion process. Once the expansion process is completed, the template (3) is inserted in the recessed seat (21 ) of the body (2). As shown in Fig. 2, the borders of the template (3) are received with clearance in the housings in undercut (22) of the body.
The body (2) shrinks during cooling. Accordingly, as shown in Fig. 3, the housings in undercut (22) of the body press on the borders of the template (3) eliminating any clearance and interrupting thermoretraction. In this way the template (3) is firmly anchored to the body (2) and at the same time prevents additional thermoretraction of the body (2). Therefore, the body (2) perfectly complies with the dimensional specifications of the template (3), regardless of the free thermoretraction that would have been suffered by the material of the body (2).
In addition to act as control element of the dimensions of the body (2), the template (3) also acts as stiffening element of the body (2), without the need to provide the body (2) with stiffening ribs that increase the complexity of the mould and without the need to use stiffening inserts that are difficult to match with the body (2). Moreover, as shown in Fig. 4, the template (3) also acts as fixing means with a frame (4) to anchor the seat (1 ) to the frame (4).
In fact, the frame (4) can be provided with screws (40) arranged in register with the holes (33) of the template.
In this case, the body (2) is disassembled from the template (3); then the template (3) is fixed to the frame (4) inserting the screws (40) in the holes (33) of the template and screwing the nuts (41 ) on the screws (40); finally, the body (2) is assembled again on the template (3) in such a way that the nuts (41 ) are received in the blind holes (23) of the body (2).
It must be noted that assembly is possible because of the fact that, once it has cooled down completely, the expanded reticulated material maintains the original dimensions also without the template.
In the following text identical elements or elements that correspond to elements that have already been described are indicated with the same reference numerals, omitting their detailed description. Figs. 5 and 6 show a seat element (101 ) according to a second embodiment of the invention, wherein the template (103) is provided with screw fixing means (133) instead of holes. Accordingly, the frame (104) is provided with holes (140) to receive the screws (133) of the template. Nuts (141 ) are screwed to the screws (133) of the template to fix the frame. In this case, it is not necessary to disassemble the body (2) from the template (103) and assemble it again on the template after fixing the template to the frame (104).
Figs. 5 and 6 show a concave template (103) provided with two flat sections (130) on opposite borders that are inserted in the housings in undercut (22) of the body (2). Accordingly, also the frame (104) must have a concave seat to receive the template (103). Numerous variations and modifications can be made to the present embodiments of the invention by an expert of the field, while still falling within the scope of the invention as claimed in the enclosed claims.

Claims

Claims
1 ) Manufacturing method of a seat element (1 ; 101 ) comprising the following phases:
- injection into a mould of expandable and reticulable polyolefin material,
- reticulation and expansion of said polyolefin material inside the mould, in such a way to obtain a body (2) having the shape of the mould,
- spontaneous release of the body (2) from the mould due to expansion,
- prosecution of expansion of the body (2) outside the mould until expansion is completed, and
- coupling of said body (2) with a template (3, 103) made of rigid material, when the body (2) has completed expansion and before the material of the body shrinks during cooling, and
- cooling and thermoretraction of the body (2) controlled by the template (3; 103), in such a way that the body complies with the original specifications of the template.
2) Method as claimed in claim 1 , characterised in that the mould is in small scale compared to the seat to be obtained.
3) Method as claimed in claim 1 or 2, characterised in that the mould is shaped in such a way that the body (2) is provided on the back surface with a recessed seat (21 ) with slightly smaller area than the surface of the body and said template (3; 103) is inserted in the recessed seat.
4) Method as claimed in claim 3, characterised in that the mould is shaped in such a way that the body (2) has a perimeter frame (20) that defines the recessed seat (21 ), housings in undercut (22) are obtained in the internal borders of the perimeter frame (20), and the borders of the template (3; 103) are inserted in the housings in undercut (22).
5) Method as claimed in any one of the above claims, characterised in that fixing means (33, 133) are provided on the template (3; 103) and the template is fixed to a support frame (4, 104).
6) Method as claimed in claim 5, characterised in that the template is fixed to the frame with screw means (40) of the frame that cross the through holes (33) obtained on the template.
7) Method as claimed in claim 5, characterised in that the template is fixed to the frame with screw means (133) of the template that are inserted in holes (140) of the frame.
PCT/EP2010/051582 2009-02-13 2010-02-09 Seat element moulded from expandable and reticulable polyolefin material WO2010092048A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
PL10705836T PL2395878T3 (en) 2009-02-13 2010-02-09 Seat element moulded from expandable and reticulable polyolefin material
CA2750804A CA2750804C (en) 2009-02-13 2010-02-09 Seat element moulded from expandable and reticulable polyolefin material
ES10705836T ES2421510T3 (en) 2009-02-13 2010-02-09 Seat element molded from expandable and crosslinkable polyolefin material
EP10705836.4A EP2395878B1 (en) 2009-02-13 2010-02-09 Seat element moulded from expandable and reticulable polyolefin material
CN2010800077380A CN102316763B (en) 2009-02-13 2010-02-09 Seat element moulded from expandable and reticulable polyolefin material
US13/138,266 US20110277909A1 (en) 2009-02-13 2010-02-09 Seat element moulded from expandable and retriculable polyolefin material
RU2011137519/12A RU2503390C2 (en) 2009-02-13 2010-02-09 Bearing support moulded from extendable and cellular polyolefin
BRPI1008079-1A BRPI1008079B1 (en) 2009-02-13 2010-02-09 METHOD OF MANUFACTURING MOLDED SEAT ELEMENT FROM POLYOLEFINE EXPANDABLE AND CROSS-CONTAINABLE MATERIAL
SI201030277T SI2395878T1 (en) 2009-02-13 2010-02-09 Seat element moulded from expandable and reticulable polyolefin material
MX2011008559A MX2011008559A (en) 2009-02-13 2010-02-09 Seat element moulded from expandable and reticulable polyolefin material.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMC2009A000028A IT1392789B1 (en) 2009-02-13 2009-02-13 SEAT PRINTED IN EXPANDABLE AND RETICULABLE POLYOLEPHIN MATERIAL.
ITMC2009A000028 2009-02-13

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WO2010092048A1 true WO2010092048A1 (en) 2010-08-19

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US (1) US20110277909A1 (en)
EP (1) EP2395878B1 (en)
CN (1) CN102316763B (en)
BR (1) BRPI1008079B1 (en)
CA (1) CA2750804C (en)
ES (1) ES2421510T3 (en)
IT (1) IT1392789B1 (en)
MX (1) MX2011008559A (en)
PL (1) PL2395878T3 (en)
RU (1) RU2503390C2 (en)
SI (1) SI2395878T1 (en)
WO (1) WO2010092048A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3170695A1 (en) 2015-11-19 2017-05-24 Markus Scheidt Seat with backrest

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103128970A (en) * 2011-11-23 2013-06-05 明安国际企业股份有限公司 Manufacturing method for polymer composite products
US10040888B1 (en) 2013-06-14 2018-08-07 Cooper-Standard Automotive Inc. Composition including silane-grafted polyolefin
US10100139B2 (en) 2013-08-01 2018-10-16 Cooper-Standard Automotive Inc. Hose, composition including silane-grafted polyolefin, and process of making a hose
US10371292B2 (en) 2014-07-02 2019-08-06 Cooper-Standard Automotive Inc. Hose, abrasion resistant composition, and process of making a hose
US10252103B2 (en) * 2015-01-08 2019-04-09 Step Fitness & Recreation, Inc. Step platform
DE102015012152B4 (en) * 2015-09-16 2018-01-25 Faurecia Innenraum Systeme Gmbh Method and device for producing an intermediate article for an interior trim part and method for producing an interior trim part
CN110268033A (en) 2016-12-10 2019-09-20 库珀标准汽车公司 Combination seal, the composition and method for manufacturing it
KR102136703B1 (en) 2016-12-10 2020-07-22 쿠퍼-스탠다드 오토모티브 인코포레이티드 Soles, compositions, and methods for their preparation
JP6745211B2 (en) * 2016-12-28 2020-08-26 株式会社ジェイエスピー Sheet core material

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB859314A (en) * 1956-11-09 1961-01-18 Jean Bourgois Improvements in and relating to expanded plastic materials produced by moulding, andto the manufacture of articles from them
FR2046644A5 (en) * 1970-05-19 1971-03-05 Wenzinger Jean Jacques Suspended foam-backed seating
DE2717268A1 (en) 1977-04-19 1978-10-26 Walter Sticht Interchangeable upholstered furniture member - has metal plate embedded in foamed plastics, carrying nut for connecting screw
EP0520577A1 (en) * 1991-06-24 1992-12-30 Lawn Comfort S.A. Process for producing an assembly
EP0802041A2 (en) * 1996-04-19 1997-10-22 Finproject - S.P.A. Injection moulding process for soles in expansible and crosslinking "EVA" based compounds
US5772822A (en) * 1996-03-14 1998-06-30 Gencorp Inc. Method of manufacturing glass panel and gasket assemblies
DE202006013633U1 (en) 2006-08-11 2007-09-20 Sks Sitzkomponenten Gmbh & Co. Kg Three-dimensional cavity molding with multi-layered construction

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2208745A (en) * 1937-12-24 1940-07-23 Milwaukee Saddlery Company Cushioned seat
US2892489A (en) * 1957-09-26 1959-06-30 Curtiss Wright Corp Furniture and seat construction
US2976916A (en) * 1958-01-15 1961-03-28 Hewitt Robins Inc Springless cushion
US4577907A (en) * 1984-10-19 1986-03-25 Air-Lock Plastics, Inc. Seat assembly
AU592592B2 (en) * 1986-09-15 1990-01-18 Tachi-S Co., Ltd. Vehicle seat
DE3823584A1 (en) * 1988-07-12 1990-01-18 Grammer Sitzsysteme Gmbh METHOD FOR PRODUCING A UPHOLSTERY PART
US5352023A (en) * 1992-09-16 1994-10-04 Jay Medical, Ltd. Seating and back systems for a wheelchair
IT1278381B1 (en) * 1995-02-22 1997-11-20 Selle San Marco Di Girardi Com BICYCLE SADDLE AND PROCEDURE FOR ITS MANUFACTURE
IT1286973B1 (en) * 1996-04-19 1998-07-24 Finproject Spa INJECTION MOLDING PROCESS FOR SOLES MADE WITH EXPANDABLE AND CROSS-LINKABLE "EVA" BASED COMPOUNDS
CN2273138Y (en) * 1996-11-05 1998-01-28 李开疆 Polyurethane moulding form full-plastic sofa
NO314764B1 (en) * 2001-01-15 2003-05-19 Porolon As Composite product and process for its preparation
ITVI20050231A1 (en) * 2005-08-12 2007-02-13 Selle Royal Spa METHOD FOR THE REALIZATION OF INTEGRAL ELASTIC SUPPORTS, AS WELL AS INTEGRAL ELASTIC SUPPORTS OBTAINABLE WITH THIS METHOD
CN2860925Y (en) * 2005-12-09 2007-01-24 张建欣 Shock-absorbing vehicle seat
US8991930B2 (en) * 2008-09-22 2015-03-31 Johnson Controls Technology Company Closed cell foam vehicle interior component and method of making same
US7837271B2 (en) * 2009-01-21 2010-11-23 Lear Corporation Vehicle seat assembly having layered seating system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB859314A (en) * 1956-11-09 1961-01-18 Jean Bourgois Improvements in and relating to expanded plastic materials produced by moulding, andto the manufacture of articles from them
FR2046644A5 (en) * 1970-05-19 1971-03-05 Wenzinger Jean Jacques Suspended foam-backed seating
DE2717268A1 (en) 1977-04-19 1978-10-26 Walter Sticht Interchangeable upholstered furniture member - has metal plate embedded in foamed plastics, carrying nut for connecting screw
EP0520577A1 (en) * 1991-06-24 1992-12-30 Lawn Comfort S.A. Process for producing an assembly
US5772822A (en) * 1996-03-14 1998-06-30 Gencorp Inc. Method of manufacturing glass panel and gasket assemblies
EP0802041A2 (en) * 1996-04-19 1997-10-22 Finproject - S.P.A. Injection moulding process for soles in expansible and crosslinking "EVA" based compounds
DE202006013633U1 (en) 2006-08-11 2007-09-20 Sks Sitzkomponenten Gmbh & Co. Kg Three-dimensional cavity molding with multi-layered construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3170695A1 (en) 2015-11-19 2017-05-24 Markus Scheidt Seat with backrest
DE102015120069A1 (en) 2015-11-19 2017-05-24 Markus Scheidt Seat with backrest

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Publication number Publication date
RU2503390C2 (en) 2014-01-10
US20110277909A1 (en) 2011-11-17
BRPI1008079B1 (en) 2020-09-15
PL2395878T3 (en) 2013-09-30
RU2011137519A (en) 2013-03-20
BRPI1008079A2 (en) 2016-03-15
CA2750804A1 (en) 2010-08-19
EP2395878B1 (en) 2013-04-17
MX2011008559A (en) 2011-09-09
SI2395878T1 (en) 2013-08-30
CA2750804C (en) 2017-07-11
CN102316763B (en) 2013-05-22
ES2421510T3 (en) 2013-09-03
ITMC20090028A1 (en) 2010-08-14
CN102316763A (en) 2012-01-11
EP2395878A1 (en) 2011-12-21
IT1392789B1 (en) 2012-03-23

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